Paving-rammer.



N. G. QVIST & W. H. NORDSTRGM.

PAVING BAMMEB.

APPLIUATION rum) JAN. 1a, 1902.

91 4,603, Patented Mar. 9, 1909 3 SHEETS-$1M!!! 1.

a axe N. G. QVIST 6: W. H. NORDSTRGM. PAVING HAMMER.

APPLICATION nun arm. 1a. 1905.

914,603 Patented Mar. 9, 1909.

3 SHEETS-SHEET 2.

N. c. QVIST & w. H. NORDSTRGM. PAVING HAMMER.

APPLIOATIOH FILED 11.18. 1908.

' 914,603. Patented Mar. 9, 1909.

8 SHEETS-SHEET 3.

UNITED STATES P AT. INT O FFICE.

NIELS CHRISTIAN QVISF AND \VILHELM llERMANX NURDS'LRC MH, Ul" HURSENS, DENMAltli.

PAVING-RAMMER.

Specification of Letters Patent.

Patented March 9, 1909.

Application filed January 18, 1908. Serial No. 411.490.

Be it known that we, Nuns Cnms'riax Qvis'r, a subject of the Kingdom of Dear mark, residin at 29 hal'n'ilcsvej. Horsens, Denmark, and VVnmnmr llrzmmxx Noun s'rnfinr, a subject of lhe llm .Jll'E of Germany, and residing at 36 Smcdegade, Hon-sens, Denmark, have invented a new and useful Pnvin -Ra1n1ner; and we do hereby declare the to lowing to he a full, clear, and exact description of the same.

This invention relates to road making me chines and has to do with an improved mechl anism for operating a gravilr paring; hanr mer therefor, together with improved mechanism for controlling the machine and regulating the operation of the hannner.

The invention will he more fully described in connection with the :\C(t()ni|i:l1i \'li|f drawings and will he more particularlr pointed out and ascertained in and h the appended claims.

In the drawings Figure l is a view in side elevation of a. road making machine mnlmdying the main feature of our invention. Fix; 2 is a plan view thereof. Fig. Jlis'a deaehed detail \'l(\\' of the tamping' hammer and parts connected therewith. Fig. l is a detached detail view of a portion of the operating" mechanism for the hammer showing; the same in side ehrvntion. Fig. 5 is a view of the part shown inl ig'. l in tronl olevu tion.

Like numerals of reference designate similar parts throughout the different figures of the drawing.

As shown the derive of our inuoiliou includes a frame 1 mciunted upon supporting Wheels 4 which wheels. which will heroinafter more fully appear, are driven h v tho operator. The frame 1 is provided with e.\'- tensionslin the form of handles wherelrv the machine may be. advanced in the operalor m such position on the pavement or road as it may he desired to operate. The wheels -1 are. mounted upon independent axles 3 which are journaled m the frame 1 and support on their inner ends a frame. .27. Gear wheels a are provided for imparting rotation to the wheels 4 and pinions 8 are slidahly and nonrolnlahly mounted on a shaft 7, as by hcln splined at U. wad said pinion.) 23 mesh Willi gears f. Levers 1t) pivotaily mounted on the frame at 11 are provided for independently throwing the pinions 5w inlo and out of :r mesh relation with the gear wheels 5. A hevel gear 12 is securhd lo the shaft 7, which is mounted in hearings ti, and said hovel gear 12 meshes with a herel gear 13, secured to :1 shaft ll. huid shall it is mounted on ts rear end with a crank 16 and is mounted in bearing 15.

It will be noted that by throwing both gears into mesh with the gear wheels 5 the operator may advance the machine slowly during the paving operation by turning the crank 16. in a straight direction. By throwing either of the genre 5 out of mesh with their respective gears 5 the direction in which the machine is advanced may he changed in accordance with which hevel gear 8 is retained in mesh with its respective gear This result is obtained hy reason oi the fact that the wheels l are mounted upon independent axles.

The lower portion of the frame '27 is contracted at 27 to inclose a hammer 28 and guide the same during its reciprocating movement. The mountm of the frame 27 on the axle 33 forms a [)H'Oll about which said frame may he turned and in order to change the line of travel of the hammer 28 in either direction from the vertical means are provided for adjusting the frame 27 on the axles 3 and locking the frame in its adjusted )osition.

As shown rods 31 are pivoted at 30 to hracheis 29 the laller are secured to the frame 27. The rou r ends oi the rods 31 ex tend through a lrunswrse member 32 supported in hrar-logiv 13 on the l'rame l and the extreme ends of the rods iii are connected to a nut which run he in tho f m of a. har 34. The hur or not :3-l is prrn id? wilh an index 231) which Iran-ls uhreaet o! a suilahly graduated strip 'M secured to the member 32. .\n adjusting screw 21.3 has threuded connection will the liar or not Ill and extends through a yoke 36 and carries on it; outer end a hand wheel 37. The yoke :56 is pivoted on the mcmher 32 so as to accommodate for the ditl'erent angles which the rods 31 assume when the frame 27 is adjusted to the right or left of the position shown in Fig. 1. It will he readily seen that as the admsting screw 35 is longitudinally immovill) able with respect to the yoke 36 that b turning the hand wheel 37 the desired a jnstment of the frame 27 will be secured throu h the connection hereinbefore describe Reference will next be had to improved means for operatin the hammer 28 and varyin the stroke t ereof.

As s own in Fig. 3 there is formed in the u iper end of the hammer 28 a socket adapted to receive a ball 41 formed on the lower end of an operating rack 40. The ball 41 is retained in the socket formed in the ham mer 28 by plates 42 bolted to said hammer and havin openin s 43 to which the rack 40 extends. he rac 40 is rovided with grooves 44 engaged by a gui mg member 45 secured to the frame 27 The guiding member 45 may be provided with a roller 46 for reducing the friction of the rack 40 in said guide. A rack actuating shaft 51 is mounted in bear s 52 disposed on the frame 27 and is rovi ed with a gear wheel 63 mesh ing wit a pinion 64 mounted on a crank or guiding shaft 65. Said shaft 13 mounted in suitable bearings as shown, and is provided with cranks 66 in cases where the hammer is to be driven manually. If it is desired to maintain the hammer 26 in an elevated position out of contact with the pavement when the machine is moved from place to place a ratchet-wheel 67 may be r1 dly secured to the shaft 65 and en aged y a pawl 68. The pawl 68'is refera l pivoted m a manner so that it w norma 1y swing out of engagement with the ratchet wheel 67 by gravity.

Gearingl instrumentalities are provided for varying t e stroke of the hammer 28 so that if a relativelyv light im act is desired between the hammer and t e road surface the hammer will be raised a relatively limited extent and then permitted to fall, whereas if an impact of reater force is desired the upwardstroke o the hammer is relatively increased so that its fall through a greater distance will correspondin 1y Increase the force of the im act. Accor%ing to the present invention tie variation of the stroke of hammer can be effected Without in any way altering or changing the operation of the crank shaft.

On the shaft 51 there is non-rotatably mounted a sleeve 5?, on which a rack segment 48 is rigidly secured in a manner to mesh with the rack 40, as shown in Fig. 4. The sleeve 53 is screwed or s lined so that segments 45) and 50 can be sli ably and nonrotnhihly mounted thereon. Segments 49 and 50 rotate with the sleeve 53 and new disposed thereon and are so proportioned wlth re pect to the segments 48 that both the segments 49 and 50 may be shifted into and out of nlinement with the se cut 48 to increase in decrmae. the length 0 stroke of the hammer 28. The segment 48 is cut away at 48 so as to free the rack 40 and permit the hammer to descend by gravity when the portion 38 is rotated abreast of the rack 40.

it will thus be seen that when the segments 49 and 50 am out of alinement with the segment 48, as shown in Fig. 5, the segment -18 will engage the teeth of the rack 40 and raise the same until the last tooth of the s ment 48 has been Withdrawn from said rac As shown in Fi 4 this adjustment would raise the rack a istance equal to the peripheral length of the seven (7) teeth on the segment 48. movement of the hammer is desired--the segment 49 is adjusted inwardly into alinement with the segment 48 so that it will bebrought into mesh with the rack 40. If a still greater lifting movement of the rack is desired the segment 50 may be adjusted inwardly in alinement with the s each revolution of the shaft 51 the rack 40 will be raised a maximum distance. Each rack segment 49 and 50 is provided with a hub 54 slidable upon the sleeve 53 and each hub is engaged by a shifter connected with a support 57 slidably mounted upon a rod 56. Each shifting member 55 is provided with an extension 58 which is pivoted to a crank 59 of an operating rod 60. The operatin rods 60 are mounted in bearings 61 an carry on their inner ends cranks 62 adapted for manipulation by the o erator.

lVhen 1t is desired to s ightly retard the action of the. hammer so as to prevent the same from engaging the pavement or road.

bed with an impact such as would result from the fall of the hammer when released If a slightly greater rising egment 49 so that at by one or more of the se ments 48 to 50 inelusive springs 69 may e connected with the hammer28 and rods 70 and said rods may extend freely through brackets 71 and carry on their upper ends adjustable nuts 72. The nuts 72 may be adjusted as desired so as to effect yielding action of the springs 69 and consequent retardation of the stroke of the hammer to any extent desired.

lf both of the gear inions 8 are in mesh with car wheels 5 an it is desired to steer the a vancing machine in a straight or other direction an adjustable steering wheel 20 may be provided. As shown said wheel 20 is carried on a spindle 19 which is mounted in a bracket 18 and a transverse member 17.

.On the upper end 21 of said spindle 19 a device as indicated at .withsaid hammer, a main gear segment leasing said hammer, means for operating sition to which the lever 22 may be adjusted.

1. A road making machine comprising in combination, a truck, a tamping hammer therefor, a rack connected with said hammer, gear segment meshing with said rack, means for operating said segment, and toothed gearing means for increasing the toothed portion of said segment to increase the stroke of said hammer.

2. A road making machine comprising in combination, a truck, a gravity acting tamping hammer therefor, arack connected with said hammer, a gear segment meshing with said rack and serving to raise and release the same, means for operating said segment, and means for increasing or decreasing the toothed portion of said segment.

3. A road making machine comprising in combination, a truck, a gravity acting tamping hammer therefor, means for operating said hammer, and toothed gearing instrnmentalities interposed between said means and hammer and including devices whereby the stroke of said hammer may be varied.

4. A road making machine comprising in combination, a truck, a gravitv acting humping ,hammer, a rack. connected with said hammer, a gear segment meshing with said rack, means for operating said segment to raise and release said rack, and an auxiliarysegment for increasin 'tl1e toothed portion, of said first mentione segment.

5. A road making machine comprising in combination, a truck, a gravity actin tamping hammer therefor, a rack connected meshing with said rack for raising and releasing said hammer, means for operating said main segment, anda plurality of auxiliary segments for increasing the toothed portion of said main segment.

6. A road making machine comprising n combination, a truck, a gravity acting lamping hammer therefor, a rack connected with said hammer, a main ear segment meshing wit said rack for raising and resaid segment, aplurality of anxilia seg'- ments, and means for ad usting sa1 anxiliary merits into and out of alinement with em mam segments to increase or de- 1 crease the toothed portion of said main segment.

7. A road making machine comprising in combination, .a truck, a gravity actin tamping hammer therefor, a rack connect with said hammer, a segment shaft, means for operating said shaft, a main segment rigidly secured to said shaft and meshing with said rack for raising and releasingsaid hammer, a lurality of auxiliary segments slidably an non-rotatably secured to said shaft, and means for adjustingsaid auxiliary se ment into and out of alinement with sai main segment to increase or decrease the toothed portion thereof.

8. A road making machine comprisin in combination, a tamping hammer, an toothed gearing instrumentalities for operating said hammer. said instrumentalities including devices for varying the stroke of said hammer.

9. A road making machine comprising in combination, a supporting frame, two supporting wheels therefor, an axle for each wheel journaled in said frame, a hammer frame pivotally mounted on the inner ends of said axles between said wheels, a hammer reciprocally mounted in said frame, for operating said hammer, said operating means being wholly supported on said hammer frame, and means for adjnstin said frame to vary the line of travel of sai hammer.

10. A road making machine comprising in combination, a truck rovided with two axles, a su porting w eel for each axle,

means for e ecting rotation of said support- 90 mg Wheels independently or in unison, a frame mounted on said axles, a' hammer mounted in said frame, means disposedon said frame for operating said hammer means ass/(minted with said truck and frame i ing the latter, a guiding or steering trailer wheel for said truck and means for adjusting and rocking sai steering wheel into its adjusted position.

In testimony whereof we have signs-dour 100 names to this specification in the nresence of two subscribing witnesses.

mats CHRISTIAN. QVIST. wmmtn HERMANN mmnsratw W'i tncsses Funsonnn, F Parmesan.

or tilt 9 5 

